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Sleek, intuitive, and powerful front-end framework for faster and easier web development.
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Several quick start options are available:

• Download the latest release.
• Clone the repo:git clone https://github.com/twbs/bootstrap.git
• Install withnpm:npm install bootstrap
• Install withyarn:yarn add bootstrap@4.1.0
• Install withComposer:composer require twbs/bootstrap:4.1.0
• Install withNuGet: CSS:Install-Package bootstrap Sass:Install-Package bootstrap.sass

Read theGetting started page for information on the framework contents, templates and examples, and more.

Within the download you'll find the following directories and files, logically grouping common assets and providing both compiled and minified variations. You'll see something like this:

bootstrap/├── css/│   ├── bootstrap.css│   ├── bootstrap.css.map│   ├── bootstrap.min.css│   ├── bootstrap.min.css.map│   ├── bootstrap-grid.css│   ├── bootstrap-grid.css.map│   ├── bootstrap-grid.min.css│   ├── bootstrap-grid.min.css.map│   ├── bootstrap-reboot.css│   ├── bootstrap-reboot.css.map│   ├── bootstrap-reboot.min.css│   └── bootstrap-reboot.min.css.map└── js/    ├── bootstrap.bundle.js    ├── bootstrap.bundle.min.js    ├── bootstrap.js    └── bootstrap.min.js

We provide compiled CSS and JS (bootstrap.*), as well as compiled and minified CSS and JS (bootstrap.min.*). CSSsource maps (bootstrap.*.map) are available for use with certain browsers' developer tools. Bundled JS files (bootstrap.bundle.js and minifiedbootstrap.bundle.min.js) includePopper, but notjQuery.

Have a bug or a feature request? Please first read theissue guidelines and search for existing and closed issues. If your problem or idea is not addressed yet,please open a new issue.

Bootstrap's documentation, included in this repo in the root directory, is built withJekyll and publicly hosted on GitHub Pages athttps://getbootstrap.com/. The docs may also be run locally.

Documentation search is powered byAlgolia's DocSearch. Working on our search? Be sure to setdebug: true inassets/js/application.js file.

1. Run through thetooling setup to install Jekyll (the site builder) and other Ruby dependencies withbundle install.
2. Runnpm install to install Node.js dependencies.
3. Runnpm run test (or a specific NPM script) to rebuild distributed CSS and JavaScript files, as well as our docs assets.
4. From the root/bootstrap directory, runnpm run docs-serve in the command line.
5. Openhttp://localhost:9001 in your browser, and voilà.

Learn more about using Jekyll by reading itsdocumentation.

• For v2.3.2:https://getbootstrap.com/2.3.2/
• For v3.3.x:https://getbootstrap.com/docs/3.3/

Previous releases and their documentation are also available for download.

Please read through ourcontributing guidelines. Included are directions for opening issues, coding standards, and notes on development.

Moreover, if your pull request contains JavaScript patches or features, you must includerelevant unit tests. All HTML and CSS should conform to theCode Guide, maintained byMark Otto.

Editor preferences are available in theeditor config for easy use in common text editors. Read more and download plugins athttp://editorconfig.org/.

Get updates on Bootstrap's development and chat with the project maintainers and community members.

• Follow@getbootstrap on Twitter.
• Read and subscribe toThe Official Bootstrap Blog.
• Jointhe official Slack room.
• Chat with fellow Bootstrappers in IRC. On theirc.freenode.net server, in the##bootstrap channel.
• Implementation help may be found at Stack Overflow (taggedbootstrap-4).
• Developers should use the keywordbootstrap on packages which modify or add to the functionality of Bootstrap when distributing throughnpm or similar delivery mechanisms for maximum discoverability.

For transparency into our release cycle and in striving to maintain backward compatibility, Bootstrap is maintained underthe Semantic Versioning guidelines. Sometimes we screw up, but we'll adhere to those rules whenever possible.

Seethe Releases section of our GitHub project for changelogs for each release version of Bootstrap. Release announcement posts onthe official Bootstrap blog contain summaries of the most noteworthy changes made in each release.

Mark Otto

• https://twitter.com/mdo
• https://github.com/mdo

Jacob Thornton

• https://twitter.com/fat
• https://github.com/fat

Code and documentation copyright 2011-2018 theBootstrap Authors andTwitter, Inc. Code released under theMIT License. Docs released underCreative Commons.